Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 220mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke220 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-20S
The AirTAC SAIJ125X220-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers substantial thrust, generating 8590N of push force at 0.7 MPa. The integrated -20 mm adjustment mechanism allows you to dial back the nominal 220 mm stroke, creating a precise 200-220 mm usable travel window. This enables fine end-position tuning at commissioning without swapping out the entire cylinder.
This bore size features a robust 32 mm carbon steel rod and M27x2 rod thread to handle high side loads, though long unsupported strokes still require an external guide. It includes a -S magnet for CMSE reed and DMSE electronic sensors, which mount cleanly into the extruded aluminum barrel's dual sensor grooves. The rear adjuster acts purely as a travel stop to set deceleration, not as a lock, so live air pressure is required to hold the load.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 220 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×220 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-20S Is Used
Variable End-Stop Forming
Dial in the exact 200-220 mm travel window on heavy metal forming presses to accommodate different material thicknesses without changing the cylinder.
Machine Changeover
Quickly fine-tune the retract end-position during product size changeovers on packaging lines, using the rear screw rather than adding external stops.
Heavy Assembly Clamping
Apply up to 8590N of push force at 0.7 MPa to secure large automotive components during assembly, while adjusting the final clamping position on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-20S the Right Cylinder?
Select this model when your application demands heavy force and variable end-stops. If 6136N of pull force at 0.5 MPa is overkill, step down to the 80 mm bore, which offers 2268N. Choose the SAIJ adjustable-stroke design over a fixed SAI cylinder when you need to fine-tune the end position during machine setup or product-size changeovers. To match this ISO 15552 replacement exactly, specify the 125 mm bore, 220 mm stroke, 20 mm adjustment, PT tapered ports, and the -S magnet option. Because the stroke is over 200 mm, ensure your mounting configuration includes an external guide to prevent excessive rod side-loading.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X220-20S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw allows you to shorten the nominal 220 mm stroke by up to 20 mm, creating a 200-220 mm usable travel window. This stopper sets the travel end and deceleration point but does not lock the load without live air pressure.
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